This may seem pretty basic. (it is!) But I thought I'd post it anyways.
Patterned paper is perfect for cutting out pieces to embellish your cards and/or layouts!! For example....I have bought busy pieces of paper just for that reason, knowing I'd probably never use them for a layout, but knew they'd make great inexpensive embellishments.
Like this paper
I have cut many butterflies from it for cards and layouts. Busy paper with trees or plants are always some of my faves.